Paint booths require precise control of environmental conditions to ensure high quality coatings. In particular, during application of the paints, relative humidity needs to be kept within well defined limits. Uncontrolled humidity values can cause defects on the coating, meaning rejects or reworking, with a significant increase in production costs. Air handling systems for paint booths need to be equipped with solutions for controlling relative humidity. Technologically-advanced products are required to ensure the correct environmental conditions with the utmost precision and reliability and minimum energy consumption. In this document CAREL provides its knowledge in the field of relative humidity control in paint booths.